package one.two.seven;

public class Mystry {
	
	public static String mystery(String s) {
		int N=s.length();
		if(N<=1) return s;
		String a=s.substring(0,N/2);
		String b=s.substring(N/2,N);
		return mystery(b)+mystery(a);
	}

	public static void main(String[] args) {
		System.out.println(mystery("abcde"));

	}

}
